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Subject[PATCH v3 12/23] tty: Kick waiters _after_ the ldisc is locked
Date

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/tty_ldisc.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index c903778..8a86a72 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -604,6 +604,12 @@ static bool tty_ldisc_hangup_halt(struct tty_struct *tty)

clear_bit(TTY_LDISC, &tty->flags);

+ /* Wakeup waiters so they can discover the tty is hupping, abort
+ * their i/o loops, and release their ldisc references
+ */
+ wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+ wake_up_interruptible_poll(&tty->read_wait, POLLIN);
+
if (tty->ldisc) { /* Not yet closed */
tty_unlock(tty);

@@ -875,12 +881,6 @@ void tty_ldisc_hangup(struct tty_struct *tty)
tty_ldisc_deref(ld);
}
/*
- * FIXME: Once we trust the LDISC code better we can wait here for
- * ldisc completion and fix the driver call race
- */
- wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
- wake_up_interruptible_poll(&tty->read_wait, POLLIN);
- /*
* Shutdown the current line discipline, and reset it to
* N_TTY if need be.
*
--
1.8.1.2


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